<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/vue.js"></script>
</head>
<body>
    <div class="app">
        <input v-focus-bind type="text">
    </div>
    <script>
        Vue.directive('focus-bind', (el, binding) => {
            setTimeout(()=>{
                el.focus()
            },0)
          })
        const app = new Vue({
          el: '.app',
        })
    </script>
</body>
</html>